[n, m] -> { s0[n, m] -> [n, m] : exists (e0 = [(-1 - n + m)/2]: 2e0 = -1 - n + m) }
{  :  }
[n, m] -> { [i0, i1] -> atomic[o0] : o0 <= 0; [i0, i1] -> separate[o0] : o0 >= 1 }
